A potentially lethal mix of heroin and the synthetic narcotic fentanyl has been found in Connecticut and is being blamed in several overdose deaths, including that of a 14-year-old girl from East Windsor.

Hartford police say they arrested two dealers last weekend, both selling the heroin and fentanyl mix in packaging labeled “new world.” Police believe the emergence of this dangerous combination is related to recent trends in overdoses.

“Over the last month or so, our homicide detectives started noticing an increase in overdoses in the area,” said Deputy Chief Brian Foley.